Column-strain insulator



July 15 1924.

L. STEINBERGER COLUMN STRAIN INSULATOR Filed Dec; 1o 1918 a /lvvE/vof? lAr Patented July 15, 1924.

UNITED STATES LOUIS STEINBERGER, 0F BROOKLYN, NEW YORK.

COLUMN-STRAIN INSULATOR.

Application filed December 10, 1918.

To all whom t may concern:

Be it known that I, LOUIS STEINBERGER, a citizen of the United States,and a resident of the borough of Brooklyn, county of Kings, andn Stateof New York, have invented certain new and useful Improvements inColumn-Strain Insulators, of which the following is a specication.

This invention relates to a column strain insulator of the rod type andto improved terminals therefor.

One of the objects of the invention is to provide a column straininsulator having at each end a bell shaped terminal secured thereto,each terminal provided with a flarin'g'skirt portion which extendsoutside the insulator at both ends and which project towards each other.

Another object of the invention is to provide such' an insulator withbell shaped terminals so constructed as to be adjustably mounted uponthe ends of the insulator to assume various positions with respect tothe` stress distributors which are permanently embedded in the ends ofthe insulator in the axial line thereof.

Another object is to provide such an insulator with adjustable bellshaped terminals, as described, and permanently7 fixedstressdistributor' members situated within the insulator body which, incombination with the bell shaped terminals, act to redistribute thedielectric stresses and strains.

@ther objects will appear from the subjoined specification and claims.

Referring to the drawings:

F ig. 1 is a vertical section of an insulator embodying my invention.

Fig. 2 is a section on line 2 2 of Fig. 1.

In the drawings in which the same reference character indicates the samepart in the several views:

10 represents the body of insulating inaterial of rod type, and it isprovided on the surface thereof with a series of alternate ridges 'l1and grooves 12, as shown, to increase its surface area. This rod may bemade of any suitable insulating` material, but I prefer to use for thispurpose that insulating material well known in the art as electrose.

The rod of insulating material may be formed in any suitable manner, asby molding it into the shape shown,` and when so formed there is moldedinto each end .in the Serial No. 266,051.

axial line of the body, two members 2O and 2l which serve as stressdistributors. `Each of these members is provided atV one end with aglobular formation, as at 22 and 23 and the shanks 24 and 25 whichproject out from the body of the insulating material at each end arescrew-threaded as at 26 and 27. Fitting over the screw-threaded ends ofeach of these Shanks are bell shaped terminals 30 and 31, the skirtportions or flanges of which extend towards each other when in the innerpositions a distance which is substantially one-third of the length ofthe insulator body. The outer edges of the skirt portions of these bellshaped terminals are beaded as at and 51. Screw-threaded holes 32 and 33are provided at the centers of the bases of the bell shaped members toengage respectively with the screwthreaded shanks of the projectingportions of the stress distributors so as to lit closely upon therespective ends of the insulator body.

Securing eyelets 40 and 41 are provided with screw-threaded cavities 42and 43 in the shanks thereof which fit over the ends of the shanks 24and 25 of the stress distributors so that the bell shaped members may beheld rigidly against the respective ends ofthe insulator in oneposition, or may be adjusted at any suitable distance away from theseends, as clearly shown in dotted lines at the left of Fig. 1.

From the above described construction it will be seen that the bellshaped portions may be adjusted inwardly Vor outwardly so as to eachcover substantially from one-third to one-quarter of the length of theinsulator body and the outer beaded edges of the bell shaped terminalsmay have varying relations as to distance with'the globular heads of thepermanently embedded stress dist-ributors 2O and 21 whichr are moldedinto the ends of the insulator rodduring the process of manufacture.'The bell shaped cup portion being iared in substantially the form shownand being entirely on the outside of the insulating material, it is tobe observed that in the event the line receives a stroke of lightning ora very high frequency impulse, the tendency would beto break down theair surrounding the insulator rather than the insulator itself.

The adjustability of the bell shaped portions with respect to theembedded stress distributors regulates the redistribution of thedielectric stresses and strains within the insulator body.

By adjusting the position ot the bell shaped members 30 and 3l, theinsulating unit may be adjusted tor use on the primary or secondarycircuit of an alternating current system of different potentials. Vhenused on the secondary or lower potential cir-- cuit the bells 30 and 3lare adjusted to an air space or spark gapy having a sate electrie valuehigher than the potential of the circuit being insulated. The same, or asimilar, insulator is applicable to the high potential circuit ot thesystem by removing the bells and permitting the internal tlv-Xdistributing or stress distributing members to oper-ate.

Moreover, when an alternating potential is applied between the endterminals or a series ot insulating units, the capacity of each unit maybe graded by' an adjustment ot the position of the bell shaped externalstress distributing members to provide a uniform distribution ofthelpotential among the units. Thus those units nearest the line wouldhave the bells in closest position to thereby increase its capacitywhile the unit next the ground would have its bells removed. Through theabove invention, therefore, it is possible to obtain a wide adjustmentin the characteristics and capabilities of a single unit to adapt it todifferent requirements, thereby avoiding the necessity of making andusing a large number of units of diierent sizes and types. Moreover, amore gradual and finer adjustment ot these properties is obtained thanis possible with a limited number ot units of fixed characteristics.

As changes of construction could be made within the scope of myinvention, it is intended that all matter contained in the abovedescription or shown in the accompanying drawings shall be interpretedas illustrative and not in a limiting sense.

Having now described my invention, what l claim as new and desire tosecure by Letters Patent is:

l. In a device oli the kind described, an insulator body. membersforming stress distributors molded within its ends, the molded-inportions of the stress distributors being provided with globular shapedends, the outwardly extending portions thereof beingscrew-threaded, bellshaped terminals one at each end of the insulator body, the skirts ofwhich surround the body of insulating material and the base portions ofeach being provided with means for engageijnent with the screw-threadedportions of the stress distributors, and 'fastening members iitting thescrew-threaded portions of the stress distributors constructed torespeetively engage the base portions O the bell shaped terminals.

2. n a device of the kind described, a body of insulating material,members embedded in the ends thereof, said members being` provided withglobular shaped ends situated in the axial line oil the insulator body,portions of said members extending outwardly from the body, bell shapedterminals adjustably mounted upon said outwardly extending portions, andfastening means on said extending portions also operating to lock theterminals in place.

3. ln a device of the kind described, a body o1c insulating material,members embedded in the ends thereof, said members being. provided withglobular shaped ends and being situated in the axial line of theinsulator body, portions of said members extending outwardly from thebody, bell shaped terminals adjustably mounted upon said outwardlyextending portions, tastening members also adjustably mounted upon saidoutwardly extending portions and coacting with the bases of the bellshaped terminals to lock the same in their respective adjustedpositions.

4;. In a device of the kind described, a body of insulating material,members provided withrounded ends forming stress distributors, onesecured to each end of the insulator body, bell shaped arcing terminalsadjustably mounted at each end of said body, the skirt portions of theterminals Haring outwardly from the body oi insulating` material andextending towardsl each other and means for jointly securing the bellshaped terminals in their adjusted positions and the device in placewhen installed.

In witness whereof, l have hereunto set my hand at the borough ofManhattan, city and State of New York, this fifth day of December, 1918.Y

LOUIS STEINBERGER.

In presencerof- .Zrr-A M. GRAHAM.

